🏎️ Speed Calculator
Calculate speed, distance, or time. Enter any two values to find the third.
About the Speed Calculator
This speed calculator runs entirely in your browser. Enter any two of distance, time, or speed, leave the third empty, and click Calculate to solve for the missing value. Nothing is uploaded — all math happens on your device.
How speed is calculated
The basic formula is:
speed = distance / time
To solve for distance: distance = speed × time. To solve for time: time = distance / speed. Units are converted automatically to keep everything consistent.
How to use the calculator
- Enter any two of the three values: distance, time, or speed.
- Leave the value you want to solve for empty.
- Click Calculate to see the result and conversions.
- Click Clear to reset.
Frequently asked questions
What if I leave more than one field empty? The calculator needs exactly two values to solve for the third. Leave exactly one field blank.
What units are supported? Distance: km, miles, meters, feet. Time: hours, minutes, seconds. Speed: km/h, mph, m/s.
What if time is 0? Speed would be infinite, so the calculator will warn you when time is 0 and you're solving for speed.
Does this tool save my data? No. All calculations happen locally in your browser.